Abstract: Using multi-source observation data such as FY4 satellite, Doppler radar, wind profiler radar, lightning monitoring, minute-level precipitation and wind, an extreme short-term heavy precipitation process in the western Sichuan Basin on August 11, 2020 was analyzed from the perspective of short-term monitoring. The results showed that during this process, the hourly rainfall intensity of multiple stations exceeded 100 mm and the range was concentrated. The wind profile radar data showed that when the low-level jet strengthened, the near-surface wind direction changed significantly, the disturbance intensified, and the high-low shear line was formed. When heavy precipitation occurred, it was accompanied by obvious ground convergence line characteristics, and Doppler radar showed clear low-level cyclone convergence. The minute precipitation had a good corresponding relationship with the height of precipitation centroid, the intensity of low-level jet, the convergence of low-level cyclone and the formation of surface convergence line. The peak characteristics such as low-level jet index and lightning frequency could lead the peak of heavy precipitation by 0.5~1 h.